LeetCode 58. Length of Last Word

描述 Given a string s consists of upper/lower-case alphabets and empty space characters ’ ‘, return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, Given s = “Hello World”, return 5.

分析 字符串序列中最后一个word的长度。 顺序扫描，记录每个word的长度，返回即可。

代码

class Solution { public: int lengthOfLastWord(string s) { int len = 0; for (size_t i = 0; i < s.size();) { if (s[i++] != ' ') ++len; else if (i < s.size() && s[i] != ' ') len = 0; } return len; } };